<script lang="ts" setup name="GoodsImage">
import { useMouseInElement } from '@vueuse/core';
import { ref ,computed} from 'vue';
defineProps<{
  image:string[]
}>()
  const active=ref(0)
  const target = ref(null)
const { isOutside, elementX, elementY } = useMouseInElement(target)
// 通过计算属性可以做边界的处理
  const position=computed(()=>{
  let x=elementX.value-100
  let y=elementY.value-100
    // 限制 x 和 y 的边界
  if(x<0)x=0
  if(y<0)y=0
  if(x>200)x=200
  if(y>200)y=200
  return {
    x,
    y
  }
 })
</script>
<template>
  <div class="goods-image">   
    <div class="middle" ref="target">
      <img :src="image[active]" />
       <div v-show="!isOutside" 
       :style="{ left: position.x + 'px', top: position.y + 'px' }"
        class="layer"></div>
    </div>
     <div  
     v-show="!isOutside" 
     class="large" 
     :style="[{backgroundImage:`url(${image[active]})`,
    backgroundPosition: `${-position.x * 2}px ${-position.y * 2}px`,}]"></div>
    <ul class="small">
      <li 
      v-for="(item,index) in image" 
      :key="item" 
      :class="{ active: index === active }"
      @mouseenter="active=index"
      >
        <img v-lazy="item" />
      </li>
    </ul>
  </div>
</template>

<style scoped lang="less">
.goods-image {
  width: 480px;
  height: 400px;
  position: relative;
  display: flex;
  z-index: 500;
  .large {
    position: absolute;
    top: 0;
    left: 412px;
    width: 400px;
    height: 400px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    background-repeat: no-repeat;
    background-size: 800px 800px;
    background-color: #f8f8f8;
  }
  .middle {
    width: 400px;
    height: 400px;
    background: #f5f5f5;
    position: relative;
    cursor: move;
    .layer {
      width: 200px;
      height: 200px;
      background: rgba(0,0,0,.2);
      left: 0;
      top: 0;
      position: absolute;
    }
  }
  .small {
    width: 80px;
    li {
      width: 68px;
      height: 68px;
      margin-left: 12px;
      margin-bottom: 15px;
      cursor: pointer;
      &:hover,
      &.active {
        border: 2px solid @xtxColor;
      }
    }
  }
}
</style>